Schema:
author (aid, homepage, name, oid)
conference (cid, homepage, name)
domain (did, name)
domain_author (aid, did)
domain_conference (cid, did)
journal (homepage, jid, name)
domain_journal (did, jid)
keyword (keyword, kid)
domain_keyword (did, kid)
publication (abstract, cid, citation_num, jid, pid, reference_num, title, year)
domain_publication (did, pid)
organization (continent, homepage, name, oid)
publication_keyword (pid, kid)
writes (aid, pid)
cite (cited, citing)
Please answer with SQL.